Canopy interaction with precipitation and sulphur deposition in two boreal forests of Québec, Canada - Ministère des Ressources naturelles et des Forêts

Summary:

Published in Environmental Pollution 162: 354-360. https://doi.org/10.1016/j.envpol.2011.12.007

The interaction of atmospheric sulphur (S) was investigated within the canopies of two boreal forests in Québec, Canada. The net canopy exchange approach, i.e. the difference between S-SO₄ in throughfall and precipitation, suggests high proportion of dry deposition in winter (up to 53%_o) as compared to summer (1-9%). However, a 3.5%_o decrease in d¹⁸O-SO₄ throughfall in summer compared to incident precipitation points towards a much larger proportion of dry deposition during the warm season. We suggest that a significant fraction of dry deposition (about 1.2 kg ha^-1 yr^-1, representing 30-40% of annual wet S deposition) which contributed to the decreased d¹⁸O-SO₄ in throughfall was taken up by the canopy. Overall, these results showed that, contrary to what is commonly considered, S interchanges in the canopy could be important in boreal forests with low absolute atmospheric S depositions.

Sector(s):

Forests

Catégorie(s):

Scientific Article

Theme(s):

Ecosystems and Environment, Forest Ecology, Forestry Research, Forests

Departmental author(s):

Duchesne, Louis, Houle, Daniel

Author(s):

MARTY, C., Daniel HOULE, Louis DUCHESNE and C. GAGNON

Year of publication:

2012

Format:

Paper

How to get the publication:

Available at the Direction de la recherche forestière

Keyword(s):

dépôt acide, couvert forestier, pluviolessivat, sulfate, écologie écosystèmes et environnement, isotope, écosystèmes et environnement, article scientifique de recherche forestière, ecosystems and environment, acid deposition, canopy, throughfall, sulphate